/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.concurrency;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
import java.util.concurrent.Callable;

import lucee.commons.io.IOUtil;
import lucee.commons.lang.ExceptionUtil;
import lucee.runtime.PageContext;
import lucee.runtime.PageContextImpl;
import lucee.runtime.engine.ThreadLocalPageContext;
import lucee.runtime.exp.PageException;
import lucee.runtime.net.http.HttpServletResponseDummy;
import lucee.runtime.net.http.ReqRspUtil;
import lucee.runtime.thread.ThreadUtil;
import lucee.runtime.type.Struct;
import lucee.runtime.type.UDF;

public class UDFCaller2<P> implements Callable<Data<P>> { 

	private PageContext parent;
	private PageContextImpl pc;
	private ByteArrayOutputStream baos;
	
	private UDF udf;
	private boolean doIncludePath;
	private Object[] arguments;
	private Struct namedArguments;
	private P passed;


	private UDFCaller2(PageContext parent) {
		this.parent = parent;
		this.baos = new ByteArrayOutputStream();
		this.pc=ThreadUtil.clonePageContext(parent, baos, false, false, false,true);
	}
	
	public UDFCaller2(PageContext parent, UDF udf, Object[] arguments,P passed, boolean doIncludePath) {
		this(parent);
		this.udf=udf;
		this.arguments=arguments;
		this.doIncludePath=doIncludePath;
		this.passed=passed;
	}
	public UDFCaller2(PageContext parent, UDF udf,Struct namedArguments, P passed,boolean doIncludePath) {
		this(parent);
		this.udf=udf;
		this.namedArguments=namedArguments;
		this.doIncludePath=doIncludePath;
		this.passed=passed;
	}
	
	
	
	@Override
	public final Data<P> call() throws PageException {
		ThreadLocalPageContext.register(pc);
		pc.getRootOut().setAllowCompression(false); // make sure content is not compressed
		String str=null;
		Object result=null;
		try{
			if(namedArguments!=null) result=udf.callWithNamedValues(pc, namedArguments, doIncludePath);
			else result=udf.call(pc, arguments, doIncludePath);
			
		} 
		finally{
			try {
			HttpServletResponseDummy rsp=(HttpServletResponseDummy) pc.getHttpServletResponse();
			
			Charset cs = ReqRspUtil.getCharacterEncoding(pc,rsp);
			//if(enc==null) enc="ISO-8859-1";
			
			pc.getOut().flush(); //make sure content is flushed
			
			pc.getConfig().getFactory().releasePageContext(pc);
				str=IOUtil.toString((new ByteArrayInputStream(baos.toByteArray())), cs); // TODO add support for none string content
			} 
			catch (Throwable e) {
				ExceptionUtil.rethrowIfNecessary(e);
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return new Data<P>(str,result,passed);
	}
}